Update sensitivity.

README.md

@@ -69,7 +69,7 @@ If you want to run the spectrum server on a different machine than the receiver
 Currently both SCM (Standard Consumption Message) and IDM (Interval Data Message) packets can be decoded but are mutually exclusive, you cannot receive both simultaneously. See [Wikipedia: Encoder Receiver Transmitter](http://en.wikipedia.org/wiki/Encoder_receiver_transmitter) for more details on packet structure.
 
 ### Sensitivity
-Using a NooElec NESDR Nano R820T with the provided antenna, I can reliably receive standard consumption messages from ~250 different meters and intermittently from another 400 meters. These figures are calculated from messages received during a 25 minute window where the preamble had no bit errors and no errors were detected or corrected using the checksum. Reliably in this case means receiving at least 10 of the expected 12 messages and intermittently means 3-9 messages.
+Using a NooElec NESDR Nano R820T with the provided antenna, I can reliably receive standard consumption messages from ~300 different meters and intermittently from another ~600 meters. These figures are calculated from the number of messages received during a 25 minute window. Reliably in this case means receiving at least 10 of the expected 12 messages and intermittently means 3-9 messages.
 
 ### Compatibility
 Currently the only tested meter is the Itron C1SR. However, the protocol is designed to be useful for several different commodities and should be capable of receiving messages from any ERT capable smart meter.